NDLI: Variable spreading and chip repetition factors (VSCRF)-CDMA in reverse link for broadband wireless access

Content Provider	IEEE Xplore Digital Library
Author	Goto, Y. Kawamura, T. Atarashi, H. Sawahashi, M.
Copyright Year	2003
Description	Author affiliation: Wireless Labs., NTT DoCoMo Inc., Kanagawa, Japan (Goto, Y.; Kawamura, T.; Atarashi, H.; Sawahashi, M.)
Abstract	This paper proposes variable spreading and chip repetition factors (VSCRF)-CDMA in the reverse link for broadband wireless access, which flexibility supports employing the same air interface both in multi-cell environments such as cellular systems and in isolated-cell environments such as hot-spot areas and indoor offices. In VSCRF-CDMA, the conventional CDMA feature, i.e., time-domain spreading using a combination of cell (or user)-specific scrambling and channelization codes, is applied in a multi-cell environment in order to suppress effectively other-cell interference to utilize one-cell frequency reuse. Meanwhile, in an isolated-cell environment, a chip repetition scheme is used in a part of the time-domain spreading by employing an orthogonal code in order to realize orthogonal multiple access by utilizing a comb-shaped frequency spectrum. Simulation results elucidate that the required average received signal energy per symbol-to-background noise power spectrum density ratio (E/sub s//N/sub 0/) using VSCRF-CDMA associated with the combination of spreading factor (SF/sub D/) = 4 and chip repetition factor (CRF) = 4 at the average packet error rate of 10/sup -2/ can be achieved by approximately 6 dB assuming four simultaneous users with the information bit rate of 6.4 Mbps each (the corresponding frequency efficiency becomes 0.62 bps/Hz) in an isolated-cell environment in a three-path Rayleigh fading channel with two-branch antenna diversity reception.
Sponsorship	IEEE Commun. Soc
Starting Page	254
Ending Page	259
File Size	776404
Page Count	6
File Format	PDF
ISBN	0780378229
DOI	10.1109/PIMRC.2003.1264272
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-07
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time domain analysis Multiaccess communication Interference suppression Working environment noise Signal to noise ratio Error analysis Bit rate Frequency diversity Fading Receiving antennas
Content Type	Text
Resource Type	Article

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